Pneumatic butterfly valve in the powder system operation

about pneumatic butterfly valve in the gas and liquid medium occasions we have discussed the use of more, and because of pneumatic butterfly valve used for solid materials ( Such as dust, powder) The situation is not much, so in terms of selection and use of the many places worthy to be discussed. Combined with practical experience about YiDeZhiJian below.
butterfly pneumatic valve control for solid materials, often in the tank bottom as feeding pneumatic valve to use, such as cement tank, such as the powder tank bottom, used for feeding and quickly cut off. Because most of dust material contains big or small particles, the pneumatic valve sealing surface wear is beyond doubt, improper selection, will greatly reduce the service life of pneumatic valves, pneumatic valves or soon leak, continue to use. There is such a case: there is a burden weighing system, the whole process of ingredients with PLC to realize automatic control, and the ingredients of car feeding pneumatic valve selection is pneumatic triple eccentric butterfly valve, medium is a very fine powder particles. Use after a period of time, the customer reflect pneumatic valve leakage, the stone piles often leaks on the workbench. Pneumatic valve returned to the factory inspection is no leakage, and customers reflect this pneumatic valve is used, and the same medium, there have been no such a thing. To find out why, the company sent to the scene, finally find out the reason, it turns out that this medium is very thin, and a bit of a sticky, although ingredients on the car is equipped with vibration motor, eventually there are quite a few are attached to the tank wall materials and parts, pneumatic valve in the pneumatic valve is closed, the card around the sealing surface, make the pneumatic valve cannot be completely shut down, causing to add material leakage, over time, also make the sealing surface of wear, and even in groove.
after find out the reason, proposed the solution: in the PLC program, extend the motor vibration time, after all shake out the material as far as possible to close the pneumatic valves; Will be weighing device zero alignment, will do to the material shows zero, it until it is all at this time only by PLC signal that close the pneumatic valves; Will triple eccentric butterfly pneumatic valve replacement for the double eccentric elastic pneumatic valve, hard seal butterfly Also can use the midline sealing rubber pneumatic valve, butterfly considering occasionally have large particles in the material, rubber seal may not be durable - — If there is no fine powder particles, can consider to use soft sealing butterfly pneumatic valve) Because of triple eccentric butterfly pneumatic valve pneumatic valve seat is a helical seal face, is face seal, the material is easy to accumulate in the seal surface, can't discharge quickly, pneumatic valve is single or double eccentric butterfly eccentric without the disadvantages, even a little seal face material, also in the pneumatic valve closing was scraped the pneumatic valve plate, thus ensuring the good sealing, and sealing surface durability. After such a transformation, such problem never happened.
in such a system, there are other factors need to be taken into account, such as: can't keep the material from the above put into a car rushed directly to the pneumatic valve pneumatic valve plate ( This impact will also make the pneumatic valve cannot be closed tightly) And the static pressure of the material must be no more than the design of the pneumatic butterfly valve bearing pressure, and so on.
the difference between the control of pneumatic valve and common manual pneumatic valve is that you can't take it as an isolated elements, and must take it as an integral part of the whole control system, pneumatic control valve of many problems in use, is not the type selection and configuration problems, but because of lack of awareness of the user to control the pneumatic valve in pneumatic control valve failed to cooperate with control system debugging, good. As long as the key to realize problem, correct selection of pneumatic valve, and in the control system debugging phase pneumatic valve debugging good, can greatly reduce the failure rate, long-term stability of the automatic control system.
YAZE( Pneumatic company's main products: pneumatic pneumatic valve pneumatic ball valve pneumatic butterfly valve pneumatic actuator